Featured Research

from universities, journals, and other organizations

Ancient Sea Spider Fossils Discovered In Volcanic Ash

Date:
October 22, 2004
Source:
Yale University
Summary:
Volcanic ash that encased and preserved sea life in the Silurian age 425 million years ago near Herefordshire, UK has yielded fossils of an ancient sea spider, or pycnogonid, one of the most unusual types of arthropod in the seas today.

A computer reconstruction of Haliestes (artificially colored, above), and a modern sea spider, Nymphon (bleached, below), which is about 50% larger, and with longer legs.
Credit: Image Yale University

New Haven, Conn. – Volcanic ash that encased and preserved sea life in the Silurian age 425 million years ago near Herefordshire, UK has yielded fossils of an ancient sea spider, or pycnogonid, one of the most unusual types of arthropod in the seas today.

Sea spiders are soft-bodied arthropods, found widely in modern oceans. For two-centuries there has been a controversy about the relationship of sea spiders to land spiders, scorpions, ticks and mites because of their unique body form. Sea spiders have a long proboscis and unusual limb structures used in mating and carrying brooding embryos. The fossil record of their relationship is sparse because of their delicate nature.

"This is the earliest adult fossil example, and it is preserved in extraordinary detail," said author Derek Briggs, professor of geology and geophysics, and Director of the Yale Institute of Biospheric Studies. "Volcanic ash that trapped ancient sea life in this location rapidly encased the creatures making a concrete-like cast of the bodies. The cavity later filled in with carbonate solids so we have a fossil record to study now."

To create a picture of the fossils, the specimens were ground away a few microns at a time, each slice digitally imaged, and then the whole reconstructed using computer graphics. The reconstruction suggests that these exotic animals are indeed related to land spiders, scorpions, mites and ticks.

The new species, Haliestes dasos,, represents the earliest known adult sea spider by 35 million years. Its large pincers place the sea spiders firmly within a larger grouping that includes scorpions, mites, ticks, the real spiders and the horseshoe crab. Despite its ancient, Silurian age the new species appears to have lived in a similar way to modern ones, on the seabed, or perhaps on sponges

The research was carried out as part of a project on the Herefordshire fauna by a team made up of Derek Siveter and Mark Sutton at Oxford, Derek Briggs at Yale, and David Siveter at Leicester. The group has made a number of other spectacular finds of soft-bodied organisms in the same deposit including crustaceans, a worm-like mollusc, a polychaete worm, and a starfish, and much that remains to be described.

###

Citation: Nature 432: 978-980 (October 21, 2004)

Further information is available at: http://www.earth.ox.ac.uk/herefordshire/haliestes/haliestes.htm


Story Source:

The above story is based on materials provided by Yale University. Note: Materials may be edited for content and length.


Cite This Page:

Yale University. "Ancient Sea Spider Fossils Discovered In Volcanic Ash." ScienceDaily. ScienceDaily, 22 October 2004. <www.sciencedaily.com/releases/2004/10/041022105150.htm>.
Yale University. (2004, October 22). Ancient Sea Spider Fossils Discovered In Volcanic Ash. ScienceDaily. Retrieved October 22, 2014 from www.sciencedaily.com/releases/2004/10/041022105150.htm
Yale University. "Ancient Sea Spider Fossils Discovered In Volcanic Ash." ScienceDaily. www.sciencedaily.com/releases/2004/10/041022105150.htm (accessed October 22, 2014).

Share This



More Plants & Animals News

Wednesday, October 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Cadaver Dogs Aid Search for More Victims of Suspected Indiana Serial Killer

Cadaver Dogs Aid Search for More Victims of Suspected Indiana Serial Killer

Reuters - US Online Video (Oct. 21, 2014) Police in Gary, Indiana are using cadaver dogs to search for more victims after a suspected serial killer confessed to killing at least seven women. Linda So reports. Video provided by Reuters
Powered by NewsLook.com
White Lion Cubs Unveiled to the Public

White Lion Cubs Unveiled to the Public

Reuters - Light News Video Online (Oct. 21, 2014) Visitors to Belgrade zoo meet a pair of three-week-old lion cubs for the first time. Tara Cleary reports. Video provided by Reuters
Powered by NewsLook.com
'Cadaver Dog' Sniffs out Human Remains

'Cadaver Dog' Sniffs out Human Remains

AP (Oct. 21, 2014) Where's a body buried? Buster's nose can often tell you. He's a cadaver dog, specially trained to find human remains and increasingly being used by law enforcement and accepted in courts. These dogs are helping solve even decades-old mysteries. (Oct. 21) Video provided by AP
Powered by NewsLook.com
White Lion Cubs Born in Belgrade Zoo

White Lion Cubs Born in Belgrade Zoo

AFP (Oct. 20, 2014) Two white lion cubs, an extremely rare subspecies of the African lion, were recently born at Belgrade Zoo. They are being bottle fed by zoo keepers after they were rejected by their mother after birth. Duration: 00:42 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins